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The featured molecules for the month of February are a number of polycyclic aromatic hydrocarbons (PAHs) discussed in the article “Fluorescence, Absorption, and Excitation Spectra of Polycyclic Aromatic Hydrocarbons as a Tool for Quantitative Analysis”. PAHs are ubiquitous in air, soils, and water as a result of both direct and indirect emissions. PAHs are discharged into environments as byproducts of the combusion of fossil fuels used for transportation and generation of electricity. Other sources of PAH emissions include industrial processes, biomass burning, waste incineration, oil spills, and cigarette smoke. Fully manipulable (Chime) versions of these molecules appear below. These and other molecules are available at Only@JCE Online. ![Static image of benzo[<em>k</em>]fluoranthene molecule.](images/JCE2004p0245fig1.gif)
Figure 1. Benzo[k]fluoranthene molecule. Interactive Chime-based structure (top); static structure graphic (bottom)
![Static image of benzo[<em>a</em>]anthracene molecule.](images/JCE2004p0245fig2.gif)
Figure 2. Benzo[a]anthracene molecule. Interactive Chime-based structure (top); static structure graphic (bottom)
![Static image of benzo[<em>a</em>]pyrene molecule.](images/JCE2004p0245fig3.gif)
Figure 3. Benzo[a]pyrene molecule. Interactive Chime-based structure (top); static structure graphic (bottom)
Figure 4. Chrysene molecule. Interactive Chime-based structure (top); static structure graphic (bottom)
Figure 5. Phenanthrene molecule. Interactive Chime-based structure (top); static structure graphic (bottom)
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